Detail Improvements in Worldmaster Series
Page 82
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nNE of the Leyland exhibits at the
Commercial Motor Show will be a Royal Tiger Worldmaster LCRTI.1 lefthand-drive 18-ft.-wheelbase chassis incorporating a number of de•tail improvements which have been made to the model since its introduction some four years ago. All are a direct result of operating -experience, and it is significant that none of them is of a major nature.
Working from the front of the chassis backwards, the first design change to be noted is that the fan-drive gearbox has been dust-proofed by using double-lip . seals for the input and output flanges, with flingers in the couplings to throw off water.
Increasing Operational Efficiency
The dynamo mounting has been changed to incorporate two separate plates with eccentric screws which permit the dynamo alignment to be adjusted and so reduce drive-line wear. All Worldmasters now have a six-bladed fan.
A large Cooper oil-bath air cleaner conforming to the H.S.'. Grade A specification has, been adopted. As before, the air-cleaner intake is ducted from the front of the chassis, but the engine breather is not now led into this duct, a separate • oil-bath filter unit • being
employed. This eliminates the possibility of oil fumes in the air duct causing a sludge trap which would obstruct engine breathing. The gearbox and axle . breathes are taken from this ductas
before. • • The cooling system has been drastically modified; arid .iS now pressurized .with a " no-loss " tank. The engine cooling is of the series-flow type, the water passing into the block and :then to the cylinder heads There are two outlet pipes from the forward head, one being the normal by-pass pipe for use when the thermostat is shut, and the second pipe to ensure that a large quantity of water is' always circulating around the block and head.
The second pipe is to prevent the highest temperature differential through the engine exceeding 5° F. A 165° F. thermostat is employed to give an ample c46
cooling margin and to ensure that in cold climates the body heaters work at full efficiency.
A 10-in.-diameter viscous vibration damper is employed at the front of the crankshaft in place of the rubber-bonded type formerly employed, and -behind this there is a double-lip seal similar to those fitted to the fan-drive gearbox.
Twin paper-element fuel filters are standard on the engine, and the C.A.V. injection pump incorporates an excessfuel baulking device which ensures that excess fuel delivery cannot be obtained when the engine is running. The control for this device is a knob adjacent to the oil-filter pipe, and it cannot be operated from the driving seat.
The air-pressure-system safety valve has been mounted on the air compressor. instead of on the reservoir, so that pressure cannot build up in the lines from the compressor, thus protecting the whole pressure system.
A Purolator oil filter is incorporated in the lubrication system of the PneurnoCyclic gearbox, the front and rear mountings of which have been improved in the interests of longevity. The rear-spring rear hanger brackets also have been redesigned to give greater strength at this point, and a secondary exhaust silencer has been introduced behind the main silencer, with the object of reducing exhaust roar."